You may want
SyncTwoFolders. I've not used it but do have it "just in case." Back in the days before I switched to SD! I was a big Synk fan and it did folder to folder very well and easily. Usually just Finder copying will suffice but there are times when something way deep inside may have a screwy permissions issue. Synk could handle those. I am unsure if SyncTwoFolders does.